Yes, under most international aviation laws in 2026, including the UK/EU 261 regulations and the updated US Department of Transportation (DOT) rules, an airline is legally required to rebook you if they cancel your flight. If the cancellation is within the airline's control (such as a mechanical issue or crew scheduling), they must offer you an alternative flight to your destination at the earliest opportunity, often on a partner airline or even a competitor if their own next flight is significantly delayed. If you choose not to be rebooked, you are entitled to a full cash refund for the unused portion of your ticket. In 2026, airlines in the UK and EU must also provide "duty of care," which includes complimentary meals, communication, and hotel accommodation if the rebooked flight departs the following day. In the US, while rebooking is required, the right to a refund is now automatic for any "significant change" or cancellation, ensuring that travelers are not forced into vouchers they do not want or cannot use.